As far as I can see from the Vat II documents, there is nothing forbidding ANY style of music in the Holy Mass. It seems that Holy Mother Church, in her wisdom, is leaving it up to the local bishops…
I disagree with you on this. First, here’s where “music” shows up (in an appropriate context) in the Constitution on the Sacred Liturgy (keeping in mind that this is an English translation of a Latin document):
“Within the limits set by the typical editions of the liturgical books, it shall be for the competent
territorial ecclesiastical authority mentioned in Art. 22, 2, to specify
adaptations, especially in the case of … sacred music … but
according to the fundamental norms laid down in this Constitution.” (n. 39)
“The musical tradition of the universal Church is a treasure of inestimable value, greater even than that of any other art. … Therefore
sacred music is to be considered the more holy in proportion as it is more closely connected with the liturgical action, whether it adds delight to prayer, fosters unity of minds, or confers greater solemnity upon the sacred rites. But
the Church approves of all forms of true art having the needed qualities, and admits them into divine worship. Accordingly,
the sacred Council, keeping to the norms and precepts of ecclesiastical tradition and discipline, and having regard to the purpose of sacred music, which is the glory of God and the sanctification of the faithful, decrees as follows.” (n. 112)
“The treasure of sacred music is to be preserved and fostered with great care.” (n. 114)
“The Church acknowledges
Gregorian chant as specially suited {proprium - “proper”} to the Roman liturgy: therefore, other things being equal, it should be given
pride of place in liturgical services. But
other kinds of sacred music, especially polyphony, are by no means excluded from liturgical celebrations, so long as they
accord with the spirit of the liturgical action, as laid down in Art. 30.” (n. 116)
“In certain parts of the world, especially mission lands, there are
peoples who have
their own musical traditions, and these
play a great part in their religious and social life. For this reason due importance is to be attached to their music, and a suitable place is to be given to it, not only in forming their attitude toward religion, but also in adapting worship to their native genius, as indicated in Art. 39 and 40.” (n. 119)
“In the Latin Church the
pipe organ is to be held in high esteem … **ut
other instruments also may be admitted for use in divine worship,
with the knowledge and consent of the competent territorial authority, as laid down in Art. 22, 52, 37, and 40. This may be done, however,
only on condition that the instruments are suitable, or can be made suitable, for sacred use, accord with the dignity of the temple, and truly contribute to the edification of the faithful.” (n. 120)
“Let [composers] produce compositions which have the
qualities proper to genuine sacred music.” (n. 121)
I will continue in another post with my commentary on these quotes, but let me make a general comment: this document continually says that local Ordinaries (i.e. Bishops, in our case) have competency in matters pertaining to allowing certain instruments and styles of music into the liturgy, but always being subject to fundamental norms that must be respected. There are universal qualities which
sacred music must possess, and which
profane music inherently lacks. I would argue that there are genres or styles of music that simply lack the qualities of sacred music.**